391568340 has 48 divisors (see below), whose sum is σ = 1154099520. Its totient is φ = 98922240.

The previous prime is 391568291. The next prime is 391568351. The reversal of 391568340 is 43865193.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170601 + ... + 172880.

It is an arithmetic number, because the mean of its divisors is an integer number (24043740).

Almost surely, 2^391568340 is an apocalyptic number.

391568340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

391568340 is an abundant number, since it is smaller than the sum of its proper divisors (762531180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391568340 is a wasteful number, since it uses less digits than its factorization.

391568340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343512 (or 343510 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 391568340 is about 19788.0858093955. The cubic root of 391568340 is about 731.5924079819.

The spelling of 391568340 in words is "three hundred ninety-one million, five hundred sixty-eight thousand, three hundred forty".